Etching machine



A. HoLMsTRM l ETCHING MACHINE 1922 2 sheets-sheet 1 Filed June y19,

lllllllelllllll Aug. 28, 1923.

A. HOLMSTRM ETCHING MACHINE I 2 sheets-sheet 2 Filed June 19. 1922Patented Aug. ZS, 1923.

exu1.V HoLMsrnra, or sr'ooxrroriivr, vSWEDEN.

' ETCHING MACHINE v.Application filed June`19, 1922. Serial No. 569,425.

`T0 all who/m, it 'may concern.'

Be it known that I, AXEL HoLMs'rnM, a subject of the King of Sweden,residing at Drottningholmsvagen 9, Stockholm, Sweden, have invented acertain new and useful lmprovement in Etching Machines, of which thefollowingV is a specification.

My invention'relates to etching machines and more particularly toetching machines in which the acid is sprayed upon t-he plates to beetched by means of a revolving paddle.

The main object of my invention is to provide inexpensive means wherebythe paddle may be easily and quickly put in and taken out. v f Y lAfurther purpose is to provide a box with an opening at one end of ytheshaft sufficiently large for easy removal through it' of the shaft andpaddle, in conjunction with' a readily removable door, preferably .ofstoneware or other acid resistant material,

normally tting about the shaft and closingclamping means forV holdingthedoor in r place. y i Further purposes will appear in the specifica-tionand in the claims.

l have preferred tov illustrate my invention by a few forms only of themany in which it may appear, selecting these'beca'use theyI arepractical, efficient and inexpensive Y the principles of my invention.-

VFigure 1 is a 'sectional'V diagrammatical view to illustratethepositionja'ndiduty; of

a addle used in etching.

figure 2 is a side elevation of an etching box equipped with myinvention; Q

3-3 of Figure 2., Y i

Figure 4 is an enlarged lbroken detail segtion of Figure 3.

Figure 5 is a front elevation of another. form. Figure 6 isa section 4ofFigure 5.

Figure 7 is a broken front elevation 0f another form. 'i' Y Figure v8isa section through line 8-8 of Figure 7. Y

ln all vdrawings like numbers refer to like parts.

Referring to the drawings and describing in illustration and not inlimitation l In etching devices ofv this character thel acid isconveniently placed within Va stoneware box and is thrown upon theplates by means of a stoneware paddle mounted upon a shaft that isprotected from the acid by through line 6-6 being 'covered with rubberor othenprotective coating. v The bearings' ofthe shaft are placedoutside of the-box to be away from the acid, the shaft extendingvclearthrough Ythe box and having a bearing at each end.

It occasionally happens that a paddle is broken, as by reason of anoperatoraccidentally dropping a plate upon it, and when this Vhappensthe paddle and shaft must' be removed, the lbroken part replaced and thewhole then put back into the box.v

Y llhe level of the etching liquor within the stoneware box is wellbelow the shaft. A revolving blade upon the paddle dips into the liquor,picks it' up andcasts it against a baffley in such a wayas to sprayitupon 1Lplates placed along the opposite wall of the ox.V Y f Theetching processxiswell' illustrated diagrammatically -in F igure 1 where@the stoneware tank 14 is filled with n etchingA liquor toa level t-aconsiderably Vbelow the shaft 15' which carrieslthe stoneware paddleld`The shaft 15 extendsV through the-sides of vthebox'- to suitablebearings 17, `'as seen in llgiire';v The revolvingpaddle v"casts theetching1-liquor into 'thebafile space 18 andfp'ast 'the baffle-19'againsti plates 2 0' set upon a "groove 2l* along 'the stonewarerestplate .122. lT he box 1 has a removable The operationofthe-mechanism toetch loo' cover 23 and aglasscover portion 24 usuallyi A y n v leftin placer` A fan25 draws-a'continuous VFigure 3 isa'broken' section through line-- a plate involves removing the cover, ifit be on, placing the plate 20Y upon the groove 21, replacing the cover23, starting the paddle and continuing its operation for asuitable timedrenching the plate with the etc-hing liquor, stopping the paddle,removing the cover and Withdra ing andA Washingl the plate. I f Thepaddle 16 may be made in a number of sections so that ifthere should bebreak f age, as by reason of an operator droppin-g a plate upon thepaddle, ashort sectiononly of. the paddle Would have to be replaced.

The shaft at each end turns Within a' universal jointbearing 17. VThesha-ft turns dition l5 to position the. door and this-may zontally at:28 and vertically atr29, the box 27 being free to turn vertically onthe pivot Y rectly in a boX 27 Which is pivoted hori- 28-l and the pivot28 being free to turn hori- Zontally on the pivot 29. n y Agt onel sideof the box provide an opening 30 suiiiciently large to permit easyreinoval4 through it of the paddle-and shaft and I close this opening`by means of a stone- 25 Ware door 31 apertured for the shaftandapproximately filling and fitting the hole 37(1)- With la flange portion32 for fitting against the outer Wall ofthe box around the opening.,Thfisgdoor 31 is provided with an. inwardly projecting; boss 33 forprotecting the shaft from: the, acid and is somewhat recessed" at 3% tomake it less heavy.Y i

Toi carrythe bearing 171 provide Wooden 35 bars; 35 andi 36, one on;each side of the box, held together by tie rods 37. These Wooden bars 35and 36 carry the universal joint hearings 17, and Ythe bar 35 alsocarries brackets 38' and setlscreivs 39 for holding the 40 door 31 inYplace.

I preferably'provide.y a gasket between theV face of. the flange 52 andthe face of the box., against which; gasket the door is pressed. Rubberor like materia-l maybe used, Vaseline or asphaltum Willv also serve thepurpose. Y

The shaft carries adriving Ypulley 40 which is driven by any suitablemotor, notshown, and which in Vturn drivesthe pulleyV 11 of the fan 25.Y p

' Should it at any time .become necessary to takeout theV shaft andpaddle, all thatv is necessary is to remove the pulley ll0-,ftheVbrackets 38 Vand the bearings 11a-liter which VV the door 31 may belifted Outland the Whole shaft with its paddles may befslid out longii ytudinally throughthe opening V30.?l

VVn the doorshown Yin, Figures 2 Yand 4l` the hole iscircularl andthegatefis likevvise 60 circular'and surrounds the shaft.

lifriguresl` andY (ishowA another forni in` y VVwhich' thevgat'eisHgeneral-ly rectangular and doesnot Wholly surroundl the shaft butVfits Y'downfover the shaft', having for this pur-l 6@ posea suitableslot. rllhe lower edge of ther Y the opening.

opening has then a semi-circular groove i2 which half Way surrounds theshaft andA semicircular groove-42 asvvith the form` ofV l*1 iguie 5.` y

rilhe outside of the boi; has a guiding porinterlock with the door toforni runifays 4:16 as shown inv Figure 8. These runways are preferablymade to project from the side of ytheI box Vso that thev gate: nia-yslide outside ofthe boX.

lt is. evident that these various forms arefY all broadlyV the: saineinvention, and l am well a-ivare that in view of my invention` anddisclosure othei` forms and variationsV Will become evident to thoseskilled in the art,

to meet individual vv iim or particular need,

and. I claim all such'mod-ilica-tions and variations in: so far as theyfall Within the reasonable spirit a-nd Scope of my invention.

Having thus described my invention, what I claim as-Ynevv and desirev tosecure by Letters Patent is 1. In an etehingiinaehine, a-boX internallyresistant to etching liquor and having an opening, `asha-ft normallypassing through the opening, a paddle resistantA to etching liquormounted upon: the sha-ftl Within the box` and adapted to pass throughthe opening and a closure about the shaft to close the opening.. Y Y w2. an etching machinea shaft, a p'adf dile resistant to: etching liquormounted upon the shaft, a boX Within which the Ypaddle is adapted tooperate and having an opening v in vits side surrounding the shaftin useand adapted topa-ss the paddle and shaft from.

the box, and a door internally resistant to etching liquor eandi with,the shaft approximatelyclosinfr the opening. f Y

3; Inl an. etc ing machine, a shaft, a pad` Vdle Vresistant to etchingliquor mounted upon the fshaft,` a pottery box within which the paddleisadaptedto operate and having Van opening in itsV sidenormallysurrounding the shaft and adaptedtopass the kpaddle and shaft'froin thebox, and a door of potteryfwithj the shaft ap'pioxiinately closing 4. 1nan etehinfrinachine arshaft a ad- "die resistant.y to, etching liquor1mounted upon the shaft, anY acid`,rresistantV box, Within. which thepaddle is adapted to operate and having an opening yin. its sidenormallyV surrounding the shaft and adapted to pass the naeaoeeL paddleand shaft from the box, a door internally resistant to etching liquorWith the shaft approximateiy closing the opening,

and a member projecting inwardly from the door to cover an adjacentportion of the shaft.`

5. In an etching machine, a box internally resistant to etching liquor,a shaft, a paddle paddle and shaft from the box, a door internallyresistant to etching liquor, with the shaft approximately closing vtheopening, having an inwardly projecting portion approximately itting thecontour of the opening and an external fla-nge to mate With the externalrim of the box about the opening and means -for pressing the door towardthe box flange.

6. n an etching machine, a shaft, a paddle resistant to etching liquormounted upon the shaft, an acid-resistant `box Within which the paddleis adapted to operate and l'iaving an opening in its Side normallysurrounding the shaft and adapted to pass the paddle and shaft from thebox, a door internally7 resistant to etching liquor, with the shaftapproximately closing the opening and clamping means for holding thedoor in place. v

7 In an etching machine, 'a shaft, a paddle resistant to etching liquormounted upon Y the shaft, an acid-resistant box Within which the paddleis adapted to operate and having an opening* in its side normallysurround-ing the shaft and adapted to pass the paddle 'and shaft fromthe box, a door internally f resistant to etching liquor, with the shaftapproximately closing the opening, and 'a .screw clamp external of thebox for no-rmally holding the door in place.

8. In an etching machine, a shaft,-a paddle resistant to etching liquormounted upon the shaft, an acid-resistant box Within which the paddle isadapted to operate and having an opening in its sidenormally surroundingthe shaft and adapted to pass the paddle and shaft from the box, a doorinternally resistant to etching liquor, With the shaft approximatelyclosing the opening, a clamp external of the box for normally 4holdingthe door in place, a bearing vfor the shaft, and common means forsupporting the ola-mp and the bearing.

y -AxEL HOLMSTRM.

